If you want to view posts of more than one type, use the following examples:

• http://www.paranoidangel.me.uk/blog/?tag=character-sarah-jane-smith,character-harry-sullivan
  gives all posts tagged with either Sarah Jane Smith or Harry Sullivan
• http://www.paranoidangel.me.uk/blog/?tag=character-sarah-jane-smith+character-harry-sullivan
  gives all posts tagged with both Sarah Jane Smith and Harry Sullivan
• http://www.paranoidangel.me.uk/blog/?tag=character-sarah-jane-smith,character-harry-sullivan&feed=rss
  gives the RSS feed for all posts tagged with either Sarah Jane Smith or Harry Sullivan

If you want to view posts in a fandom and type, use the following example:

• http://www.paranoidangel.me.uk/blog/category/doctor-who/?tdo_tag=sarah-jane-smith
  gives all posts in the fandom Doctor Who and with the character Sarah Jane Smith
• http://www.paranoidangel.me.uk/blog/category/doctor-who/?tdo_tag=character-sarah-jane-smith+length-drabble
  gives all posts in the Doctor Who fandom and with the character Sarah Jane Smith and are drabble length (no or for this, you'll just have to search twice instead)